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Communications

Google Looks to "White Space" Spectrum 95

Nerdposeur writes "After maneuvering the major carriers into agreeing to open access rules via the recent spectrum auction, Google appears to be looking into a new area of spectrum that could provide internet connectivity. 'In comments filed with the Federal Communications Commission, the Internet leader outlined plans for low-power devices that use local wireless airwaves to access the 'white space' between television channels. A Google executive called the plan 'Wi-Fi 2.0 or Wi-Fi on steroids.' Interestingly, Google has Microsoft, Intel, and others on their side in this one. Was this spectrum their target all along?"
Hardware Hacking

From "Happy Hacking" to "Screw You" 243

tquid writes "Trying to bridge the digital divide in Canada's poorest postal code, a principled group of hackers adopt "open source"-based technology spun off from an MIT project. Then the terms on the hardware are changed, and changed again, and then firmware to lock out the frustrated group's software is installed, screwing them out of their investment and many hours of development work."
Science

Beer-Drinking Scientist Debunks Productivity Correlation 130

austinpoet writes in with a blog post debunking the theory we discussed a few days back that scientists' beer consumption is linearly correlated with the quality of their work. Chris Mack, Gentleman Scientist and beer drinker, has analyzed the paper and found it is severely flawed. From his analysis: "The discovered linear relationship between beer consumption and scientific output had a correlation coefficient (R-squared) of only about 0.5 — not very high by my standards, though I suspect many biologists would be happy to get one that high in their work... Thus, the entire study came down to only one conclusion: the five worst ornithologists in the Czech Republic drank a lot of beer."
Math

Calculating the Date of Easter 336

The God Plays Dice blog has an entertaining post on how the date of Easter is calculated. Wikipedia has all the messy details of course, but the blog makes a good introduction to the topic. "Easter is the date of the first Sunday after the first full moon on or after March 21... [T]he cycle of Easter dates repeat themselves every 5,700,000 years. The cycle of epacts (which encode the date of the full moon) in the Julian calendar repeat every nineteen years. There are two corrections made to the epact, each of which depend[s] only on the century; one repeats (modulo 30, which is what matters) every 120 centuries, the other every 375 centuries, so the [p]air of them repeat every 300,000 years. The days of the week are on a 400-year cycle, which doesn't matter because that's a factor of 300,000. So the Easter cycle has length the least common multiple of 19 and 300,000, which is 5,700,000 [years]."
Operating Systems

Linux Gains Native RTOS Emulation Layer 89

nerdyH writes to tell us that the Xenomai/SOLO project is attempting to deliver VxWorks and other RTOS emulation for any Linux kernel. "Some weeks ago, I started laying the groundwork for porting the Xenomai emulators natively over the PREEMPT_RT kernel. Unlike the co-kernel based Xenomai version, SOLO does not require any kernel support from additional modules or patches. It is fully based on the standard POSIX library, and runs as a regular process controlled by a single image Linux kernel. As a first step, a VxWorks emulator has just been rebuilt over this new framework."
Data Storage

How To Use a Terabyte of RAM 424

Spuddly writes with links to Daniel Philips and his work on the Ramback patch, and an analysis of it by Jonathan Corbet up on LWN. The experimental new design for Linux's virtual memory system would turn a large amount of system RAM into a fast RAM disk with automatic sync to magnetic media. We haven't yet reached a point where systems, even high-end boxes, come with a terabyte of installed memory, but perhaps it's not too soon to start thinking about how to handle that much memory.

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